Sounds surround us from birth or even from before birth. You may not think about them at all and pay no attention to them - they do not usually bother you. We are accustomed to the everyday city noise so much that without it we feel that there is something missing.

To prove this point scientists often tell the true story about a certain American entrepreneur, who once made a very successful business on a fashionable beach in California, where wealthy urban people spent their holidays. What do you think he did? He sold LPs and audio cassettes with city noise recordings. There were noises of buses and trams, shouts of the crowd, etc. The cassettes and LPs sold very well.